Re: [secdir] secdir review of draft-ietf-v6ops-tunnel-loops-01

Fred Baker <> Thu, 30 December 2010 07:42 UTC

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To: Tom Yu <>
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Subject: Re: [secdir] secdir review of draft-ietf-v6ops-tunnel-loops-01
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Question for you. I have left the authors off the paper for the moment.

Mr Gont has recently posted a draft:
  "Mitigating Teredo Rooting Loop Attacks", Fernando Gont, 7-Sep-10,

and is pushing for adoption as a working group draft. When asked to consider merging his paper with this or another draft, he has been unwilling. The chairs have basically told him to discuss his draft on the list "and we'll see where it goes". 

One of your criticisms of this draft is that it doesn't cover his USENIX material. Would you prefer that this and Mr Gont's draft be merged? 

On Dec 29, 2010, at 8:00 PM, Tom Yu wrote:

> This document describes routing loop vulnerabilities inherent in the
> existing design of IPv6-in-IPv4 tunneling protocols, and suggests
> mitigation strategies.
> While the Security Considerations section of this document claims that
> the recommended checks do not introduce new security threats, Section
> 3.1 mentions that the additional processing overhead for checking
> destination and source addresses may be considerable.  It would be
> useful to have measurements or estimates of how this additional
> processing overhead compares to the effects of the routing loop attack
> that it is intended to mitigate.
> This document makes no mention of the Teredo attacks that are
> discussed in the USENIX WOOT paper.  The authors may wish to mention
> draft-gont-6man-teredo-loops-00 for the sake of completeness.
> Editorial:
> Section 3 lists three categories of mitigation measures but the
> accompanying text states that they fall under two categories.
> In Section 3.1, in the sentence "However, this approach has some
> inherit limitations", replace "inherit" with "inherent".
> In Section 4, in the sentence "...other mitigation measures may be
> allowed is specific deployment scenarios", replace "may be allowed is"
> with "may be feasible in".